Office (OLE) / .XLS malware analysis — malicious · bbe1eb4a211c3eba

MALICIOUS

Office (OLE) / .XLS

69.5 KB Created: 2022-12-27 08:12:56 First seen: 2022-12-28

MD5: ce54d081d00b983982282acf1d91a8b4 SHA-1: bf6e96350ec21d3b2efd9da222e7871b755cc0fb SHA-256: bbe1eb4a211c3ebaf885b7584fc0936b9289b4d4f4a7fc7556cc870de1ff0724

348 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The XLS file contains VBA macros that leverage WScript.Shell and CreateObject to download a file from a URL using Microsoft.XMLHTTP and save it to disk using ADODB.Stream. This indicates a downloader functionality, likely to fetch and execute a secondary payload. The ClamAV detection further confirms its malicious nature.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
ClamAV: Xls.Downloader.b83ac4c497e169b5-9980307-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.b83ac4c497e169b5-9980307-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `d47c11c549e93befac5f0323e84435236abf48c8df536f617f7bb6b080032c85`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	4184 bytes

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